For Service Technician Use Only
COMPONENT TESTING (Cont.)
3-14
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Whirlpool
®
and KitchenAid
®
Filtration and Maytag
®
24" Microfiltration Dishwashers
Overfill Switch Circuit
Perform the following checks if the dishwasher detects F8E4
when there is no water in the leak pan, or if F8E4 is not detected
when water is present in the leak pan. The following items are
part of the overfill switch circuit:
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Harness/Connection
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Overfill Switch/Float Assembly
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Control Board
Test Procedure
1.
Unplug dishwasher or disconnect power.
2.
Remove toe and outer door panels to access leak pan and
control board.
3.
Check leak pan for water. If no water is present, go to step 5.
If leak pan is full of water, unplug float switch, remove pan
and empty. Replace pan and reconnect float switch.
4.
Reconnect power. If F8E4 fault does not return, find source of
leak and repair.
NOTE:
If root cause of overfill is not corrected, customer will
experience another overfill and service call in the future.
Strip Circuit - Overfill Switch
5.
Inspect float assembly. Verify that connector is fully seated.
Ensure that Styrofoam floater moves freely up and down and
no debris is preventing it from sitting in the down (closed)
position.
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If no issue found, go to step 6.
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Repair/reconnect if any issues found.
6.
Disconnect connector P11 from control board.
7.
Using an Ohmmeter, measure across P11 pins 6 and 7 with
the float assembly connected and installed in the leak pan.
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If 3 ohms or less is measured, go to step 8.
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If high resistance is measured, check for loose
connections and repair/replace as needed.
8.
Using an Ohmmeter, measure across P11 pins 6 and 7 with
the Styrofoam floater lifted up (switch should be open).
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If reading is infinite, go to step 9.
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If reading shows continuity, replace float assembly and
retest.
9.
Set meter to DC and connect leads to P11 pins 6 and 7.
10.
Plug in dishwasher or reconnect power and verify that
13 VDC is present across P11 pins 6 and 7 with P11
disconnected from the board.
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If 13 VDC is not present, replace the control and retest.
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If 13 VDC is present, proceed to step 10.
11.
Reconnect P11 to control board and run Diagnostics cycle to
confirm operation.
12.
Reassemble all parts and panels. Ensure that float assembly is
connected, seated in leak tray, and tray is reinstalled.
13.
Plug in dishwasher or reconnect power.
DANGER
Electrical Shock Hazard
Only authorized technicians should perform
diagnostic voltage measurements.
After performing voltage measurements,
disconnect power before servicing.
Failure to follow these instructions can result in
death or electrical shock.
Electronic Control
P11-7
Electronic Control
P11-6
Input
13 VDC
Overfill Switch
(In normal position, float
assembly holds switch closed)
N.O.
